EP1595998B1 - Verfahren und Vorrichtung zur Vermischung und Entgasung von Stoffströmen - Google Patents

Verfahren und Vorrichtung zur Vermischung und Entgasung von Stoffströmen Download PDF

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Publication number
EP1595998B1
EP1595998B1 EP05009018.2A EP05009018A EP1595998B1 EP 1595998 B1 EP1595998 B1 EP 1595998B1 EP 05009018 A EP05009018 A EP 05009018A EP 1595998 B1 EP1595998 B1 EP 1595998B1
Authority
EP
European Patent Office
Prior art keywords
degassing
pulp
suspension
paper machine
mixing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP05009018.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1595998A1 (de
Inventor
Josef Glawogger
Erich Harzl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz AG
Original Assignee
Andritz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andritz AG filed Critical Andritz AG
Publication of EP1595998A1 publication Critical patent/EP1595998A1/de
Application granted granted Critical
Publication of EP1595998B1 publication Critical patent/EP1595998B1/de
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/26—De-aeration of paper stock
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/342—Mixing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the invention relates to a method for mixing streams, in particular in the constant part of a paper machine, and a device for carrying out the method.
  • a pulp suspension is applied evenly distributed on a sieve and removed in the first part a large part of the water. In particular impurities are removed before the suspension is applied to the sieve.
  • the pulp suspension also contains gas, in particular air, as free air in the form of bubbles and as dissolved air. This air, especially in the form of bubbles, causes problems in the papermaking process, especially if they are in larger quantities. This can lead to foaming problems, instabilities of the process, pulsations in the constant part of the paper machine, reduced drainage performance and, as a consequence, small holes in the paper web.
  • the various fiber components (long fibers, short fibers, rejects, etc.) are currently being combined in a container and mixed.
  • various chemical adjuvants e.g., wet strength agent, paint, filler, etc.
  • the individual components and also auxiliaries can be introduced into a mixing pipeline.
  • the problem with these circuit variants is that the substances are mixed only insufficient and additionally have a high gas content, which is contained in both the individual streams of pulp components, as well as in the white water.
  • the EP 0 543 866 B1 shows, for example, a plant in which the gas is removed from the previously mixed substance and from the white water of the paper machine by means of several pumps. However, the mixing of pulp components and auxiliaries is not accomplished.
  • the EP 1 347 094 A1 (Andritz AG ) describes a device for degassing and simultaneous mixing of chemicals. In such a device not the entire mixture but only a part is degassed.
  • the WO 95/10350 (Kvaerner Pulping Technologies AB) discloses a method and apparatus where a fluid, preferably an ozone-containing gas, is fed to a pulp suspension. Inert carrier gas and unused ozone are then separated from the pulp suspension in a gas separator.
  • the invention now wants to prevent these disadvantages and is therefore characterized in that the individual material flows are brought together in a first process step and mixed together in a second process step and simultaneously degassed.
  • simultaneous degassing results in a constant state after mixing, which makes it possible to dispense with the previously required large mixing vessel.
  • an accurate measurement of physical properties, in particular the consistency allows.
  • dilution water for example white water from a paper machine
  • the white water can also be deaerated. This can be achieved in many cases, a degree of ventilation, which makes a complex vacuum ventilation superfluous.
  • the consistency of the pulp suspension is measured after mixing and degassing and the supply of dilution water is carried out depending on the consistency of the mixed and degassed pulp suspension.
  • dilution water By the good mixing of the dilution water also a high accuracy can be achieved. But there may be others as well Material values such as ash content, whiteness or degree of grinding can be measured particularly accurately online.
  • An advantageous embodiment of the invention is characterized in that the mixed and degassed suspension is a storage container, eg Maschinenbütte, standpipe, is supplied.
  • a storage container eg Maschinenbütte, standpipe
  • the storage container can be even further homogenization and in particular an elimination of any pulsations reached, but should be paid to a small volume, so that a variety change or color change can be performed quickly.
  • the previous good mixing can be dispensed with the previously required Mischbütte.
  • the invention also relates to a device for mixing streams, in particular in the constant part of a paper machine.
  • a degassing device in particular a rotor with degassing
  • a mixing pipe This allows a particularly good mixing while degassing the pulp suspension can be achieved.
  • a plurality of pipelines for material flows, in particular pulp components, open into the mixing pipeline upstream of the degassing device, with a dilution water line also opening into the mixing pipeline.
  • a dilution water line also opening into the mixing pipeline.
  • the mixing and homogenization is much more intensive here than by means of a mixing vessel.
  • the invention is further characterized in that a measuring device for at least one material value of the suspension is provided downstream of the degassing device, the measuring device being a consistency measuring device which is connected via a regulating device to a valve in the dilution water line.
  • the consistency of the pulp suspension in the feed to the paper machine can be set particularly accurately.
  • other measuring devices such as, for example, whiteness, ash content or freeness can be used, which provide particularly accurate measured values, in particular because of the virtually gas-free and homogeneous suspension.
  • a particularly advantageous embodiment of the invention is characterized in that the white water line of a paper machine opens into the mixing pipe.
  • the entire white water can be degassed together with the admixed substances, in particular pulp components.
  • a favorable variant of the invention is characterized in that the mixing pipe is connected to the degassing device with a storage container, said storage container can be designed as a standpipe.
  • the standpipe can in this case form a communicating vessel with the white water container, as a result of which the system becomes self-regulating.
  • An alternative advantageous embodiment of the invention is characterized in that the mixing tube is connected to the degassing device with a pump. This results in particularly low storage volumes and thus a particularly favorable possibility for variety or color change of production.
  • the invention makes it possible to avoid large degassing tanks, which leads to large investment savings. It can thus also realize a "short flow" concept in a simple and inexpensive way.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP05009018.2A 2004-05-13 2005-04-25 Verfahren und Vorrichtung zur Vermischung und Entgasung von Stoffströmen Ceased EP1595998B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT8302004 2004-05-13
AT0083004A AT414244B (de) 2004-05-13 2004-05-13 Verfahren und vorrichtung zur vermischung von stoffströmen

Publications (2)

Publication Number Publication Date
EP1595998A1 EP1595998A1 (de) 2005-11-16
EP1595998B1 true EP1595998B1 (de) 2014-06-11

Family

ID=34935688

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05009018.2A Ceased EP1595998B1 (de) 2004-05-13 2005-04-25 Verfahren und Vorrichtung zur Vermischung und Entgasung von Stoffströmen

Country Status (6)

Country Link
US (1) US7520961B2 (zh)
EP (1) EP1595998B1 (zh)
CN (1) CN100536976C (zh)
AT (1) AT414244B (zh)
CA (1) CA2505214C (zh)
NO (1) NO20052154L (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009006715A1 (de) * 2009-01-29 2010-08-05 Voith Patent Gmbh Ausschussaufbereitung
DE102013209998A1 (de) * 2013-05-29 2014-05-22 Voith Patent Gmbh Konstantteil-Mischvorrichtung

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219340A (en) 1978-12-14 1980-08-26 Clark & Vicario Corporation Method and apparatus for outflowing liquids from chamber maintained under vacuum
SE8404573D0 (sv) * 1984-09-12 1984-09-12 Celleco Ab Anordning for avgasning och omblandning av floden
FI87247C (fi) * 1990-08-14 1992-12-10 Ahlstroem Oy Matningsarrangemang och -foerfarande foer en pappersmaskin foer behandling av en fibermassastroem
SE501894C2 (sv) 1993-10-13 1995-06-12 Kvaerner Pulping Tech Förfarande och anordning för inmixning av fluid i en massasuspension
FI103676B (fi) * 1998-06-10 1999-08-13 Metso Paper Inc Paperi- tai kartonkikoneen lyhyen kierron prosessijärjestely
FI103678B (fi) * 1998-06-10 1999-08-13 Metso Paper Automation Oy Menetelmä paperin tai kartongin neliömassan säätämiseksi paperi- tai k artonkikoneessa
EP0969142B1 (en) * 1998-06-29 2004-03-24 Voith Paper Patent GmbH Process and device for mixing stock suspensions
FI116078B (fi) * 1998-12-30 2005-09-15 Metso Paper Inc Menetelmä massan syöttämiseksi perälaatikkoon
EP1218587B1 (en) * 1999-09-21 2006-06-21 Metso Paper, Inc. Regulation system for the short circulation and headbox of a paper machine or equivalent
AT413018B (de) * 2002-03-21 2005-10-15 Andritz Ag Maschf Verfahren und vorrichtung zum fördern von fliessfähigen medien
DE20316687U1 (de) * 2003-10-29 2004-01-29 Voith Paper Patent Gmbh Vorrichtung zum Entgasen von mindestens einer Suspension

Also Published As

Publication number Publication date
ATA8302004A (de) 2006-01-15
AT414244B (de) 2006-10-15
CN1704141A (zh) 2005-12-07
CA2505214C (en) 2012-03-13
NO20052154L (no) 2005-11-14
NO20052154D0 (no) 2005-05-02
US7520961B2 (en) 2009-04-21
EP1595998A1 (de) 2005-11-16
CA2505214A1 (en) 2005-11-13
CN100536976C (zh) 2009-09-09
US20050269051A1 (en) 2005-12-08

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